int(platform.h): In platform.h, define OIIO_DEVICE macro (#4290)

Signed-off-by: Larry Gritz <[email protected]>

Author: lgritz

src/include/OpenImageIO/platform.h

@@ -524,8 +524,10 @@
 // function decorators needed when compiling for CUDA devices.
 #ifdef __CUDACC__
 #    define OIIO_HOSTDEVICE __host__ __device__
+#    define OIIO_DEVICE __device__
 #else
 #    define OIIO_HOSTDEVICE
+#    define OIIO_DEVICE
 #endif